workflows: run a test via job-runner

...and report the status against the same PR.

This gives us something like a partial real-world test against real
GitHub.

Author: allisonkarlitskaya

.github/workflows/test.yml

@@ -19,6 +19,30 @@ jobs:
       - name: Run test
         run: test/run
 
+  job-runner:
+    runs-on: ubuntu-22.04
+    permissions:
+      pull-requests: read
+      statuses: write
+    steps:
+      - name: Clone repository
+        uses: actions/checkout@v4
+
+      - name: Create job-runner config
+        run: echo "forge.github.token = '${{ secrets.GITHUB_TOKEN }}'" > override.toml
+
+      - name: Run job-runner on this PR
+        run: |
+          ./job-runner \
+              -F override.toml \
+              run \
+                '${{ github.repository }}' \
+                --pull '${{ github.event.number }}' \
+                --context 'job-runner/test'
+
+      - name: Show the logs
+        run: find ~/.cache/cockpit-dev/job-runner-logs -type f -name log -exec head -vn-0 {} +
+
   cockpituous:
     runs-on: ubuntu-22.04
     permissions: